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1/////////////////////////////////////////////////////////////////////////////
2// Name: src/msw/region.cpp
3// Purpose: wxRegion implementation using Win32 API
4// Author: Vadim Zeitlin
5// Modified by:
6// Created: Fri Oct 24 10:46:34 MET 1997
7// RCS-ID: $Id$
8// Copyright: (c) 1997-2002 wxWidgets team
9// Licence: wxWindows licence
10/////////////////////////////////////////////////////////////////////////////
11
12// ============================================================================
13// declarations
14// ============================================================================
15
16// ----------------------------------------------------------------------------
17// headers
18// ----------------------------------------------------------------------------
19
20// For compilers that support precompilation, includes "wx.h".
21#include "wx/wxprec.h"
22
23#ifdef __BORLANDC__
24 #pragma hdrstop
25#endif
26
27#include "wx/region.h"
28
29#ifndef WX_PRECOMP
30 #include "wx/gdicmn.h"
31#endif
32
33#include "wx/msw/private.h"
34
35IMPLEMENT_DYNAMIC_CLASS(wxRegion, wxGDIObject)
36IMPLEMENT_DYNAMIC_CLASS(wxRegionIterator, wxObject)
37
38// ----------------------------------------------------------------------------
39// wxRegionRefData implementation
40// ----------------------------------------------------------------------------
41
42class WXDLLEXPORT wxRegionRefData : public wxGDIRefData
43{
44public:
45 wxRegionRefData()
46 {
47 m_region = 0;
48 }
49
50 wxRegionRefData(const wxRegionRefData& data) : wxGDIRefData()
51 {
52#if defined(__WIN32__) && !defined(__WXMICROWIN__) && !defined(__WXWINCE__)
53 DWORD noBytes = ::GetRegionData(data.m_region, 0, NULL);
54 RGNDATA *rgnData = (RGNDATA*) new char[noBytes];
55 ::GetRegionData(data.m_region, noBytes, rgnData);
56 m_region = ::ExtCreateRegion(NULL, noBytes, rgnData);
57 delete[] (char*) rgnData;
58#else
59 RECT rect;
60 ::GetRgnBox(data.m_region, &rect);
61 m_region = ::CreateRectRgnIndirect(&rect);
62#endif
63 }
64
65 virtual ~wxRegionRefData()
66 {
67 ::DeleteObject(m_region);
68 m_region = 0;
69 }
70
71 HRGN m_region;
72
73private:
74// Cannot use
75// DECLARE_NO_COPY_CLASS(wxRegionRefData)
76// because copy constructor is explicitly declared above;
77// but no copy assignment operator is defined, so declare
78// it private to prevent the compiler from defining it:
79 wxRegionRefData& operator=(const wxRegionRefData&);
80};
81
82#define M_REGION (((wxRegionRefData*)m_refData)->m_region)
83#define M_REGION_OF(rgn) (((wxRegionRefData*)(rgn.m_refData))->m_region)
84
85// ============================================================================
86// wxRegion implementation
87// ============================================================================
88
89// ----------------------------------------------------------------------------
90// ctors and dtor
91// ----------------------------------------------------------------------------
92
93wxRegion::wxRegion()
94{
95 m_refData = (wxRegionRefData *)NULL;
96}
97
98wxRegion::wxRegion(WXHRGN hRegion)
99{
100 m_refData = new wxRegionRefData;
101 M_REGION = (HRGN) hRegion;
102}
103
104wxRegion::wxRegion(wxCoord x, wxCoord y, wxCoord w, wxCoord h)
105{
106 m_refData = new wxRegionRefData;
107 M_REGION = ::CreateRectRgn(x, y, x + w, y + h);
108}
109
110wxRegion::wxRegion(const wxPoint& topLeft, const wxPoint& bottomRight)
111{
112 m_refData = new wxRegionRefData;
113 M_REGION = ::CreateRectRgn(topLeft.x, topLeft.y, bottomRight.x, bottomRight.y);
114}
115
116wxRegion::wxRegion(const wxRect& rect)
117{
118 m_refData = new wxRegionRefData;
119 M_REGION = ::CreateRectRgn(rect.x, rect.y, rect.x + rect.width, rect.y + rect.height);
120}
121
122wxRegion::wxRegion(size_t n, const wxPoint *points, int fillStyle)
123{
124#if defined(__WXMICROWIN__) || defined(__WXWINCE__)
125 wxUnusedVar(n);
126 wxUnusedVar(points);
127 wxUnusedVar(fillStyle);
128 m_refData = NULL;
129 M_REGION = NULL;
130#else
131 m_refData = new wxRegionRefData;
132 M_REGION = ::CreatePolygonRgn
133 (
134 (POINT*)points,
135 n,
136 fillStyle == wxODDEVEN_RULE ? ALTERNATE : WINDING
137 );
138#endif
139}
140
141wxRegion::~wxRegion()
142{
143 // m_refData unrefed in ~wxObject
144}
145
146wxObjectRefData *wxRegion::CreateRefData() const
147{
148 return new wxRegionRefData;
149}
150
151wxObjectRefData *wxRegion::CloneRefData(const wxObjectRefData *data) const
152{
153 return new wxRegionRefData(*(wxRegionRefData *)data);
154}
155
156// ----------------------------------------------------------------------------
157// wxRegion operations
158// ----------------------------------------------------------------------------
159
160// Clear current region
161void wxRegion::Clear()
162{
163 UnRef();
164}
165
166bool wxRegion::Offset(wxCoord x, wxCoord y)
167{
168 wxCHECK_MSG( M_REGION, false, _T("invalid wxRegion") );
169
170 if ( !x && !y )
171 {
172 // nothing to do
173 return true;
174 }
175
176 AllocExclusive();
177
178 if ( ::OffsetRgn(GetHrgn(), x, y) == ERROR )
179 {
180 wxLogLastError(_T("OffsetRgn"));
181
182 return false;
183 }
184
185 return true;
186}
187
188// combine another region with this one
189bool wxRegion::Combine(const wxRegion& rgn, wxRegionOp op)
190{
191 // we can't use the API functions if we don't have a valid region handle
192 if ( !m_refData )
193 {
194 // combining with an empty/invalid region works differently depending
195 // on the operation
196 switch ( op )
197 {
198 case wxRGN_COPY:
199 case wxRGN_OR:
200 case wxRGN_XOR:
201 *this = rgn;
202 break;
203
204 default:
205 wxFAIL_MSG( _T("unknown region operation") );
206 // fall through
207
208 case wxRGN_AND:
209 case wxRGN_DIFF:
210 // leave empty/invalid
211 return false;
212 }
213 }
214 else // we have a valid region
215 {
216 AllocExclusive();
217
218 int mode;
219 switch ( op )
220 {
221 case wxRGN_AND:
222 mode = RGN_AND;
223 break;
224
225 case wxRGN_OR:
226 mode = RGN_OR;
227 break;
228
229 case wxRGN_XOR:
230 mode = RGN_XOR;
231 break;
232
233 case wxRGN_DIFF:
234 mode = RGN_DIFF;
235 break;
236
237 default:
238 wxFAIL_MSG( _T("unknown region operation") );
239 // fall through
240
241 case wxRGN_COPY:
242 mode = RGN_COPY;
243 break;
244 }
245
246 if ( ::CombineRgn(M_REGION, M_REGION, M_REGION_OF(rgn), mode) == ERROR )
247 {
248 wxLogLastError(_T("CombineRgn"));
249
250 return false;
251 }
252 }
253
254 return true;
255}
256
257// Combine rectangle (x, y, w, h) with this.
258bool wxRegion::Combine(wxCoord x, wxCoord y,
259 wxCoord width, wxCoord height,
260 wxRegionOp op)
261{
262 return Combine(wxRegion(x, y, width, height), op);
263}
264
265bool wxRegion::Combine(const wxRect& rect, wxRegionOp op)
266{
267 return Combine(rect.GetLeft(), rect.GetTop(),
268 rect.GetWidth(), rect.GetHeight(), op);
269}
270
271// ----------------------------------------------------------------------------
272// wxRegion bounding box
273// ----------------------------------------------------------------------------
274
275// Outer bounds of region
276void wxRegion::GetBox(wxCoord& x, wxCoord& y, wxCoord&w, wxCoord &h) const
277{
278 if (m_refData)
279 {
280 RECT rect;
281 ::GetRgnBox(M_REGION, & rect);
282 x = rect.left;
283 y = rect.top;
284 w = rect.right - rect.left;
285 h = rect.bottom - rect.top;
286 }
287 else
288 {
289 x = y = w = h = 0;
290 }
291}
292
293wxRect wxRegion::GetBox() const
294{
295 wxCoord x, y, w, h;
296 GetBox(x, y, w, h);
297 return wxRect(x, y, w, h);
298}
299
300// Is region empty?
301bool wxRegion::Empty() const
302{
303 wxCoord x, y, w, h;
304 GetBox(x, y, w, h);
305
306 return (w == 0) && (h == 0);
307}
308
309// ----------------------------------------------------------------------------
310// wxRegion hit testing
311// ----------------------------------------------------------------------------
312
313// Does the region contain the point (x,y)?
314wxRegionContain wxRegion::Contains(wxCoord x, wxCoord y) const
315{
316 if (!m_refData)
317 return wxOutRegion;
318
319 return ::PtInRegion(M_REGION, (int) x, (int) y) ? wxInRegion : wxOutRegion;
320}
321
322// Does the region contain the point pt?
323wxRegionContain wxRegion::Contains(const wxPoint& pt) const
324{
325 return Contains(pt.x, pt.y);
326}
327
328// Does the region contain the rectangle (x, y, w, h)?
329wxRegionContain wxRegion::Contains(wxCoord x, wxCoord y,
330 wxCoord w, wxCoord h) const
331{
332 if (!m_refData)
333 return wxOutRegion;
334
335 RECT rect;
336 rect.left = x;
337 rect.top = y;
338 rect.right = x + w;
339 rect.bottom = y + h;
340
341 return ::RectInRegion(M_REGION, &rect) ? wxInRegion : wxOutRegion;
342}
343
344// Does the region contain the rectangle rect
345wxRegionContain wxRegion::Contains(const wxRect& rect) const
346{
347 return Contains(rect.x, rect.y, rect.width, rect.height);
348}
349
350// Get internal region handle
351WXHRGN wxRegion::GetHRGN() const
352{
353 return (WXHRGN)(m_refData ? M_REGION : 0);
354}
355
356// ============================================================================
357// wxRegionIterator implementation
358// ============================================================================
359
360// ----------------------------------------------------------------------------
361// wxRegionIterator ctors/dtor
362// ----------------------------------------------------------------------------
363
364void wxRegionIterator::Init()
365{
366 m_current =
367 m_numRects = 0;
368
369 m_rects = NULL;
370}
371
372wxRegionIterator::~wxRegionIterator()
373{
374 delete [] m_rects;
375}
376
377// Initialize iterator for region
378wxRegionIterator::wxRegionIterator(const wxRegion& region)
379{
380 m_rects = NULL;
381
382 Reset(region);
383}
384
385wxRegionIterator& wxRegionIterator::operator=(const wxRegionIterator& ri)
386{
387 delete [] m_rects;
388
389 m_current = ri.m_current;
390 m_numRects = ri.m_numRects;
391 if ( m_numRects )
392 {
393 m_rects = new wxRect[m_numRects];
394 for ( long n = 0; n < m_numRects; n++ )
395 m_rects[n] = ri.m_rects[n];
396 }
397 else
398 {
399 m_rects = NULL;
400 }
401
402 return *this;
403}
404
405// ----------------------------------------------------------------------------
406// wxRegionIterator operations
407// ----------------------------------------------------------------------------
408
409// Reset iterator for a new region.
410void wxRegionIterator::Reset(const wxRegion& region)
411{
412 m_current = 0;
413 m_region = region;
414
415 if (m_rects)
416 {
417 delete[] m_rects;
418
419 m_rects = NULL;
420 }
421
422 if (m_region.Empty())
423 m_numRects = 0;
424 else
425 {
426 DWORD noBytes = ::GetRegionData(((wxRegionRefData*)region.m_refData)->m_region, 0, NULL);
427 RGNDATA *rgnData = (RGNDATA*) new char[noBytes];
428 ::GetRegionData(((wxRegionRefData*)region.m_refData)->m_region, noBytes, rgnData);
429
430 RGNDATAHEADER* header = (RGNDATAHEADER*) rgnData;
431
432 m_rects = new wxRect[header->nCount];
433
434 RECT* rect = (RECT*) ((char*)rgnData + sizeof(RGNDATAHEADER));
435 size_t i;
436 for (i = 0; i < header->nCount; i++)
437 {
438 m_rects[i] = wxRect(rect->left, rect->top,
439 rect->right - rect->left, rect->bottom - rect->top);
440 rect ++; // Advances pointer by sizeof(RECT)
441 }
442
443 m_numRects = header->nCount;
444
445 delete[] (char*) rgnData;
446 }
447}
448
449wxRegionIterator& wxRegionIterator::operator++()
450{
451 if (m_current < m_numRects)
452 ++m_current;
453
454 return *this;
455}
456
457wxRegionIterator wxRegionIterator::operator ++ (int)
458{
459 wxRegionIterator tmp = *this;
460 if (m_current < m_numRects)
461 ++m_current;
462
463 return tmp;
464}
465
466// ----------------------------------------------------------------------------
467// wxRegionIterator accessors
468// ----------------------------------------------------------------------------
469
470wxCoord wxRegionIterator::GetX() const
471{
472 wxCHECK_MSG( m_current < m_numRects, 0, _T("invalid wxRegionIterator") );
473
474 return m_rects[m_current].x;
475}
476
477wxCoord wxRegionIterator::GetY() const
478{
479 wxCHECK_MSG( m_current < m_numRects, 0, _T("invalid wxRegionIterator") );
480
481 return m_rects[m_current].y;
482}
483
484wxCoord wxRegionIterator::GetW() const
485{
486 wxCHECK_MSG( m_current < m_numRects, 0, _T("invalid wxRegionIterator") );
487
488 return m_rects[m_current].width;
489}
490
491wxCoord wxRegionIterator::GetH() const
492{
493 wxCHECK_MSG( m_current < m_numRects, 0, _T("invalid wxRegionIterator") );
494
495 return m_rects[m_current].height;
496}